Abstract: A retractable bed mechanism is disclosed. The bed mechanism comprises a sitting pad, a sitting back, a leg seat and a base seat interconnected by a plurality of linking rods and two driving means. The driving means drives the linking rods so as to drive the sitting pad, the sitting back and the leg seat so as to provide various sitting or laying or upright position to the user which facilitates face to face conversation or accessible to objects or other activities.

Abstract: A stroller that accepts and supports various types of child's car seats is easily converted from its operational state to its storage state by actuating a latching mechanism. The stroller includes a lever which facilitates the removal of the child's car seat. A seat assembly can be attached to the stroller to convert the stroller from a child's car seat carrier to a toddler stroller. The seat assembly remains in the upright position when the stroller is converted from the storage state to the operational state.

Abstract: A collapsible structure including an upright, a sliding block, at least one collapsible leg, and at least one a jointed structure, wherein the jointed structure includes a joint located on the upright or on the sliding block that includes two distinct jointing points, so that a side of a deployment triangle, which is jointed at the distinct jointing points, constitutes a rigid guiding triangle defined by these two distinct jointing points and by a third joint.

Abstract: A single hand folding structure for an umbrella folding stroller includes a folding set to connect between a pair of side frames of the stroller. The folding set is provided with a driving lever, and a driver is arranged at one of the side frames. A connecting element connects between the driver and the driving element. When a user folds the stroller, the user can pull the driver to move the driving lever via the connecting element and force the folding set to fold so the two sides of the frame are moved inward closely to each other. An elastic element of the frame is utilized to assist the folding of the frame such that the user can fold the frame of the stroller easily and effortlessly. Thus, the user can operate with a single hand, without using a foot, to release the frame to fold.

Abstract: The “One-Hand Operation Conversion for Wheelbarrow Handles” added to a wheelbarrow, on one hand, offers single hand operability and maneuverability, and on the other hand offers added benefits to dual-handed users. The wheelbarrow can easily be converted from dual to single-handed operation and then back again with this said unit. This is completed by adding a centrally mounted handle to cross support(s) which are attached to the two longitudinally extending handles of the said wheelbarrow. When the center handle is attached, one-hand operation is achieved by the load balancing capabilities of the said handle and its mounting orientation. The center handle is formed into or mounted to the cross support(s) that are mounted to the existing longitudinal handles. The unit size dimensions and mounting method are arbitrary and will be made to fit the circumstances of mounting position and cross support material. The cross support(s) material and the handle material are of variable rigid form.

Abstract: A body receptacle for a wheeled frame allows for the transport of babies in a bicycle trailer. The body receptacle has a flexible mat that is brought into the intended transport form with the help of tensioning devices.

Abstract: The disclosed articulated wheel assemblies and associated vehicles, for example wheelchairs, include articulated wheel assemblies with at least one offset connecting arm rotatably attached at one end to a payload platform, for example a seat, and attached at the other end to a linear actuator, where the linear actuator is further connected to a wheel. Embodiments include a rotary actuator for varying the linear actuator swing angle, a rotary actuator for eccentrically rotating a hubless wheel, a linear actuator motor for varying the length of the linear actuator, and a propulsion motor. Embodiments provide omnidirectional motion, stepping action when presented with obstacles, irregular surface negotiation, tight space maneuvering and other features to provide disabled people increased mobility. Alternate embodiments include a payload platform with a support strut, which is rotatably attached to an offset connecting arm and pivotally mounted to a seat.

Abstract: A foldable baby trailer includes a bottom frame, detachably provided with two rear wheels, two rear frame bars, a handlebar, a top frame bar, two front frame bars, and a trailer bar provided with a front wheel. The handlebar, the top frame bar, the two rear frame bars and the two front frame bars can be directly folded up and closely attached to the bottom frame to reduce the size for storage when the two bottom ends of the handlebar are unlocked from the two rear frame bars. Further, the user can grasp the top grip of the handlebar with the hands to push/pull the foldable baby trailer and to use the foldable baby trailer as an independent baby cart after disconnection of the trailer bar from the bicycle.

Abstract: A seat rotating device for a baby stroller includes a rotation unit connected to an underside of the seat and two insertions on two sides of an underside of the rotation unit are inserted into a positioning unit. The rotation unit has a disk and the seat is connected to the disk. The disk has a plurality of positioning holes defined in a periphery thereof. The disk is pivotably connected to a base by a shaft extending through a center of the disk and the base. The base has two wings and the two insertions are inserted into the wings. Each wing has a biasing member inserted therein which his connected with a cable. The biasing member is inserted into one of the positioning holes to position the disk and the seat at an angle.

Abstract: A folding structure of a carrier includes an expansion member connected between a base frame and an extension member. As the expansion member pivotally passes through the point of over-tangency (the turning point of balance of force), the extension member is extended or folded due to a liner bias force provided by the expansion member and also due to the change in length of the expansion member. For example, the expansion member starts to elongate itself when passing through the point of over-tangency, generating a force to extend the extension member in an extended position automatically.

Abstract: This is a device by which a stroller is also equipped with a table on the back of the stroller frame. The table is connected to the stroller frame and is allowed to rotate to provide a flat table surface for the user of the stroller. A safety strap is also provided on the top of the table surface to secure a child, if necessary.

Abstract: A collapsible, foldable support structure and conveyance has a frame assembly with multiple interconnected frame members, junction blocks located at intersecting ends of some of the frame members, and wheels attached to the junction blocks or directly to frame members. Fixtures are attached to or integrally formed with the junction blocks for mounting of wheels or other conveyances or components to the frame assembly. A support structure is attached to the frame assembly to support a load such as a human or cargo or both. In a folded configuration, the frame members are moved into a generally parallel arrangement and the junction blocks and conveyances attached to the junction blocks or frame members are drawn together.

Abstract: A raising wheel chair includes a lifting device with a telescopic guide. With the lifting device, the raising frame can be moved up and down both in sitting and in standing position. It is therefore possible to vary the level of the seat or the footrest. Thanks to the tilted arrangement of the telescopic guide, the user of the chair will, on an upward movement, also be moved closer to the objects of interest. The inclined arrangement of the telescopic guide can provide room for the front wheels and permit a short length of the raising wheel chair.

Abstract: A cart assembly comprising a housing and a wheel assembly mounted in the housing, releasable locking means for selectively positioning said wheel assembly between operative and stored limit positions, a handle assembly and means for selectively positioning the handle between an outer operative limit position and an inner stored limit position inside the housing.

Abstract: A folding carrier assembly converts to a bicycle trailer, a three-wheeled jogging stroller and a four wheeled casting stroller. The carrier assembly has a lower main frame. An arched rear or back frame member is pivotally connected to an aft portion of the lower main frame. The carrier assembly further has a single longitudinal arched member with a first end and a second end. A center support pivotally connects the arched member first end to a central fore area of the lower main frame. A user interface in the form of a release mechanism removably couples the arched member second end to a central area of the arched rear frame member. The carrier has two wheel assemblies on opposite lateral sides of the lower main frame. Wheel guards are disposed external and lateral to the wheel assembly. Supports on the fore portion of the lower main frame enable removable coupling to a jogging wheel assembly or a pair of caster wheels. Alternatively, a trailer tongue may be connected to one of the supports.

Abstract: A single hand folding structure for an umbrella folding stroller includes a connecting element is utilized to connect between a single hand release structure and a driving piece of a folding set. The single hand release structure is disposed on a handle bar of a frame of the umbrella folding stroller so as to allow a user to directly operate with a single hand to release the folding set. An elastic element of the frame is utilized to assist the partial folding of the frame such that the user can directly push the handle bar to fold the frame. Thus, the user avoids using a foot to release the frame to fold and, subsequently, prevents damage to shoes.

Abstract: The low-high chair provides a specially designed wheelchair with a seat that can be raised or lowered so that the wheelchair can be maneuvered in or out of a van without the risk of bumping someone's head on the roof of the van. The chair may also be adjusted for other purposes, such as driving a van, sitting at tables of various heights, or merely adjusting one's height to get a better view or be at the same height as one's contemporaries (e.g., at a movie theater or the like). The lift mechanism is operated by a pneumatic cylinder which is powered by an on-board compressed air tank. An inexpensive pneumatic valve may be used to raise or lower the chair, controlled by either the wheelchair user, or an assistant. The pneumatic tank may provide enough stored energy to raise and lower the user several times a day without recharging.

Abstract: A pet stroller assembly includes an open topped housing that has a bottom wall and a peripheral wall being attached to and extending upwardly from the bottom wall. A plurality of legs is attached to and extends downwardly from the bottom wall. Each of a plurality of wheels is rotatably coupled to one of the legs. A handle is attached to the housing. A canopy is hingedly coupled to the housing and is selectively positioned in a closed position abutting the peripheral wall or in an open position extending upwardly from the peripheral wall. The canopy extends at least 3 inches upwardly from the peripheral wall when the canopy is in the closed position.

Abstract: A stroller, in particular a rehabilitation stroller, having a front frame which extends upward to the rear, at an angle <90° to the ground and has two front frame struts, which are directed forward and downward and are equipped at their respectively lower ends with front wheels, and has a push bar at its rear, upper end, and having a rear frame which extends downward to the rear and is fastened at its upper end to the front frame and/or to the push bar thereof and is equipped at its rear, lower end with rear wheels. In order to obtain optimum shock absorption for the child and optimum maneuverability of the stroller, the latter comprises, according to the invention, a frame construction which serves as a seat carrier or is actually part of a seat, is guided in a longitudinally displaceable manner on the two front frame struts and is supported with respect to the front frame struts on at least one spring bearing, the spring force of which can be adjusted.

Abstract: A double occupancy baby stroller having a guiding handle and a generally stork shaped body having head and tail sections. The body is separable into an upper portion and a lower portion. A child's seat is removably mounted on the upper portion and wheeled legs are attached to the lower portion. An infant carrier is detachably mounted inside the head of the body. Both child's seat and infant carrier can be effectively used in a vehicle.

Abstract: A wheel assembly for a stroller includes a wheel with a rim that has two vertical side surfaces and a vertical central plane. A vertical pivot shaft is disposed within a mounting space in the wheel, is located in the central plane, and extends through a fixed seat that is adapted to be mounted fixedly to a stroller frame and that is attached to a rotatable seat. A wheel seat is connected to the wheel and the rotatable seat so as to permit rotation of the wheel and the wheel seat about the vertical pivot shaft.

Abstract: A stroller comprises a handle having a shape resembling the inverted letter U, armrests pivotally joined to the handle, front legs pivotally joined to the armrests, respectively, rear legs pivotally joined to the armrests, respectively, front wheels held on lower end parts of the front legs, respectively, and rear wheels held on lower end parts of the rear legs, respectively. The front legs are set so as to extend obliquely away from each other toward the front wheels. The rear legs are set so as to extend obliquely away from each other toward the rear wheels.

Abstract: A portable folding wheelchair includes a front U-shaped tube and a rear U-shaped tube pivotally coupling with each other through a pin to form a X-shape. The front U-shaped tube has an upper end on two sides to fasten to a connection plate. The connection plate connects to a backrest. The front U-shaped tube has a lower section on two sides to pivotally engage with an upright tube. The upright tube and the rear U-shaped tube have an upper end bridging a sleeve. The wheelchair has a simple structure and may be folded in forward, rearward, upward and downward directions to become a smaller size to facilitate carrying or storing in a car to enable disabled people to use in travels and trips.

Abstract: A single-handed remote controller is disclosed. Such a controller is installed at the handle of an accordion frame and is connected to a lock mechanism of the frame through a flexible element. As the remote controller rotates relative to the handle, the flexible element is coiled around the handle, changing the relative position between the lock mechanism and the handle. The frame is thus changed to make the folding much easier.

Abstract: The low-high chair provides a specially designed wheelchair with a seat that can be raised or lowered so that the wheelchair can be maneuvered in or out of a van without the risk of bumping someone's head on the roof of the van. The chair may also be adjusted for other purposes, such as driving a van, sitting at tables of various heights, or merely adjusting one's height to get a better view or be at the same height as one's contemporaries (e.g., at a movie theater or the like). The lift mechanism is operated by a pneumatic cylinder which is powered by an on-board compressed air tank. An inexpensive pneumatic valve may be used to raise or lower the chair, controlled by either the wheelchair user, or an assistant. The pneumatic tank may provide enough stored energy to raise and lower the user several times a day without recharging.

Abstract: A raising wheel chair is disclosed which includes a lifting device with a telescopic guide. With the lifting device, the raising frame can be moved up and down both in sitting and in standing position. It is therefore possible to vary the level of the seat or the footrest. Thanks to the tilted arrangement of the telescopic guide, the user of the chair will, on an upward movement, also be moved closer to the objects of interest. The inclined arrangement of the telescopic guide can provide room for the front wheels and permit a short length of the raising wheel chair.

Abstract: A collapsible wheelchair for allowing a user to easily tote a wheelchair along on a public transportation such as an airplane and bus. The collapsible wheelchair includes a collapsible seat support assembly; wheel assemblies upon which the collapsible seat support assembly is mounted; brackets mounted to the collapsible seat support assembly; wheels rotatably mounted to the brackets; a seat member supported by the collapsible seat support assembly; footrest assemblies attached to the collapsible seat support assembly; handle members mounted to the collapsible seat support assembly; strap members attached to the seat member for securing a person upon the seat member; and a storage bag for storing the collapsible wheelchair.

Abstract: A child-carrying and diaper-changing cart for providing a mobile stand that is prevented from tipping.

Abstract: In cycles, including tricycles, having a longitudinally extending frame supporting a front wheel and a subframe including a rear axle supporting a pair of laterally spaced rear wheels, and supporting a seat for a rider, and having a headtube comprising a tubular member extending axially along a steering axis, a front handlebar stem comprising a tubular member extending axially downwardly into the headtube, and a front wheel fork yoke comprising a tubular member extending axially upwardly into the headtube, simplified quick tool-free mounting assemblies are provided, including a tool-free frame-to-subframe mounting assembly mounting the frame to the subframe with an insertion motion requiring no tools, a tool-free seat-to-frame mounting assembly removably and adjustably mounting the seat to the frame with an insertion motion along the direction of travel of the cycle and requiring no tools, and a tool-free stem-to-yoke mounting assembly mounting the stem to the yoke with an insertion motion requiring no tools.

Abstract: An expandable stroller includes a frame assembly that has a front portion and a rear portion. The front portion is slidably coupled to the rear portion such that a length of the frame assembly is adustable. A first seat member is coupled to the front portion of the frame assembly. A second seat member is coupled to the rear portion of the frame assembly. The second seat member is for supporting a second child in a seated position when the user puts the second child in the second seat member when the frame assembly is extended to full length. The first seat member is positionable adjacent the second seat member when the front portion of the frame assembly is slid with respect to the rear portion of the frame assembly such that the frame assembly is for only accommodating one child.

Abstract: A patient transfer platform that is used by the patient to lift himself/herself using his/her upper body strength to a supported position on a non-slip platform rollable on lockable wheels or casters which is then easily maneuvered about even when supporting the patient so that many partially disabled persons could remain in their homes with their families instead of being institutionalized. A method of transferring a patient that utilizes the patient transfer platform is also provided. The patient transfer platform includes a patient support deck assembly, a support frame having four frame legs secured to the patient support deck assembly and a rear trailing arm assembly secured to the patient support deck assembly.

Abstract: A wheelchair has a seat that can be raised or lowered to enhance use of the chair. The seat can also be tilted to facilitate entry into and exit from the wheelchair. The lift mechanism for raising, lowering and tilting the seat includes a pair of rotatable tubes mounted to a lower frame of the wheelchair, and a pair of screws threadably received in the tubes with an upper end connected to the seat. A battery operated reversible motor is operatively connected to the tubes to rotate the tubes in a first direction to extend the screws and thereby raise or tilt the seat. The motor is operable in an opposite direction to rotate the tubes so as to retract the screws, thereby lowering the seat. The frame of the wheelchair is U-shaped, such that the wheelchair can be backed into position around a toilet. The seat includes a pair of cushions that can be laterally opened to allow a person to use the toilet while seated in the wheelchair.

Abstract: A wheelchair has a reclining seat that has a back portion and a bottom portion. The wheelchair also has a frame, which has a lower portion onto which wheels are attached and a substantially vertical portion extending upwardly from the lower portion. The back of the seat is attached to the substantially vertical portion of the frame. The wheelchair has a first mode for normal seating in which the substantially horizontal lower portion supports the bottom portion of the seat. The seat also has a second, reclined mode in which the seat is reclined backwardly relative to the normal position. The bottom and back portions of the seat and the substantially vertical portion of the frame are rotated together to tilt the seat into the reclined position. The lower portion of the seat is pivotally mounted on the lower portion of the frame, such that the lower portion of the frame remains substantially in place as the seat itself is tilted, and does not tilt with the seat.

Abstract: The invention pertains to wheelchairs, and more particularly, to a wheelchair seat having a seat back member which substantially maintains a constant vertical angle when the seat bottom or rail is pivotably raised and lowered. Accordingly, the angle between a seat back and seat rail is changed during adjustment of the seat rail.

Abstract: A mobile seat arrangement is provided which is configured to collapse for ease of storage and transportation. An x-brace, a rear lock brace and a front racking brace help to hold the mobile seat arrangement in an upright position for use as a stroller, wheelchair, or other seating arrangement. The braces also facilitate the collapse of the mobile seat arrangement in a compact fashion. Placement hooks are also provided to place a seat and back portion into the frame of the mobile seat arrangement. The mobile seat arrangement can also be tilted, with the angle between the seat and back of the seat and back portion remaining constant as the frame is tilted for the user. Arm rests and foot rests are also included.

Abstract: A wheelchair having a seat and a plurality of wheels for rolling the wheelchair along a ground surface. A plurality of legs are provided for supporting the seat. Each of the legs is positioned between the seat and one of the wheels. A plurality of struts are also provided. The seat bottom and seat back are pivotally coupled to the seat bottom. The seat back is movable between a folded position and an unfolded position. An actuator for providing at least one actuator output signal in response to movement of the actuator by a user of the device is also provided.

Abstract: An invalid dolly for transporting an individual such as a patient or invalid between various sitting locations, for example, on a bed, on a toilet, or in a wheelchair, has a pair of front wheels with a pair of fixed crutch tips in front of and slightly above the front wheels, a pair or rear caster wheels, a diagonally upwardly extending handle, a padded cushion and hand and foot crossbars. The dolly is tipped toward the individual to a position where the handle is nearly vertical and the dolly is resting on the pair of fixed crutch tips. The patient grips a crossbar handle with his chest or stomach against the cushion and with his feet resting on a footbar. The helper or orderly then draws the handle toward him pivoting the dolly onto a pair of front wheels and eventually also onto a pair of rear casters 21. The patient is then resting on the cushion and is wheeled to a new location and the process reversed to deposit him again in a sitting position.

Abstract: An adjustable side frame for a wheelchair comprises an upper side frame and a lower side frame. The upper and lower side frames are connected together by first and second connections. The first and second connections are each structured to be axially and pivotally displaceable relative to the upper and lower side frames to permit the elevation and angle of the upper side frame relative to the lower side frame to be adjusted.

Abstract: A suspension for a vehicle includes an apron having a seat fixed thereon, a steering handle supporting member pivotally affixed to opposite sides of a rear portion of apron, a left front frame member and a right front frame member, each the front frame member having a front wheel installed to a front end thereof. A left rear frame member and a right rear frame member each have a rear wheel installed to a rear end thereof. A guard support, a left front link and a right front link are provided. Each front link is connected between a substantially middle portion of the front frame member and a lower end of the handle supporting piece. A left rear link and a right rear link, each connected between a substantially middle portion of the rear frame member and the pivoting point of the steering handle supporting member.

Abstract: A power chair is provided comprising a frame transversely foldable between operating and transport positions. A seat is connected to the frame, with a pair of drive wheels also connected to the frame. The drive wheels are rotatable about a transverse axis below a portion of the seat supporting an occupant's thighs. The power chair further includes motors for driving respective drive wheels. Perspective motor/drive wheel combinations are pivotally connected to the frame. At least one ground-engaging idler wheel is connected to the frame, located rearward of the drive wheels. At least one anti-tip wheel is positioned above ground, forward of the drive wheels, and connected to the frame for movement relative to the frame upon encountering an obstacle.

Abstract: A wheelchair having a seat and a plurality of wheels for rolling the wheelchair along a ground surface. The seat includes a seat bottom and a seat back pivotally coupled to the seat bottom. The seat back is movable between a folded position and an unfolded position. The seat bottom has a back end formed from a first curved shape, and the seat back has a bottom end formed from a second curved shape. The first curved shape of the seat bottom is sized to mate with the second curved shape of the seat back when the seat back is in the unfolded position. A motor coupled to each rear wheels and a control stick is in communication with each motor for independently operating each of the motor to drive and steer the wheel chair.

Abstract: A power wheelchair has a frame, a seat connected to the frame, a pair of drive wheels connected to the frame and rotatable about transverse axis below a portion of the seat supporting the wheelchair occupant's thighs and at least one ground-engaging idler wheel connected to the frame behind the drive wheels.

Abstract: The present invention is an infant rocking chair, which can be adapted for young children and provide either the rocking or swing motion. The present invention comprises a collapsible device that can cause the state of infant rocking chair to be converted into either a folded state or an unfolded one, by which the user can convert the infant rocking chair into the collapsible state when the infant rocking chair is not used and reduce the space occupied by the same for a convenient storage. Moreover, the infant rocking chair according to the present invention further comprises a support leg for converting the state of the rocking chair into a swing position or a fixed position.

Abstract: An improved folding creeper designed for being folded to define a rolling utility cart, a rolling stool having a storage receptacle under the seat, or to be folded for storage within a drawer of a conventional tool chest. The improved creeper includes a frame segmented into a first support frame hingeably attached to a second support frame, which is hingeably attached to a third support frame. First, second and third cushions are mounted to the respective support frames to provide comfort to the user. A head rest cushion is attached to the cushion mounted on the third support frame via a tether. Casters are secured under the first and second support frames for accomplishing mobility of the creeper in its various configurations. A pair of oppositely disposed first telescoping braces is provided for maintaining a selected relative orientation of the third support frame and the first and second support frames, collectively.

Abstract: An all terrain wheelchair for outdoor recreational use is made of non-corrosive materials, such as polyethylene plastic, stainless steel and aluminum, and includes opposite frame members, a collapsible hinged brace assembly fitted between the frame members which locks in an expanded box configuration to hold the opposite frame members apart, defining an operable position for use of the wheelchair. The front and rear wheels include wide rims having horizontal ribs to provide increased traction and surface contact area when traversing soft terrain. Removable armrests are provided to aid ingress and egress of a person in and out of the wheelchair. A shade cover mounts to the frame members to provide protection from the sun and rain. In the expanded, locked position, the box shaped brace assembly provides a storage area under the seat and includes hinged doors at the rear and an open front to provide access to an interior of the box structure.

Abstract: A shock-absorbing device for a toy stroller includes a first member having a first end riveted to the upper frame and a second end. The second end of the first member includes a root section and a distal hooked section. The root section has a snapping fastener provided on each of two first lateral faces thereof. The shock-absorbing device further includes a second member having a second end riveted to the lower frame and a second end. The second end of the second member includes two second lateral walls defining a channel therebetween through which the second end of the first member is extended. Each second lateral wall includes an opening defined therein for engaging with an associated snapping fastener. The second member further includes a ridge formed therein for securely engaging with the distal hooked end of the first member.

Abstract: A personal mobility vehicle having front and rear chassis members interconnected by a locking means. The rear chassis member includes alignment means for aligning the rear chassis with a suspension assembly of the front chassis. An adjustable seat assembly supports a user while preventing accidental disengagement of the locking means.

Abstract: A wheelchair is comprised of a foldable chair, having a selectively inclinable back support, fixedly or removably attached to a castor-based platform. A foot rest is slidably attached to the platform. A padded walker and a padded head rest each having height adjustment capability are each removably attachable to the wheelchair. A leg rest having incline capability above and below the horizontal is removably attachable to the wheelchair. A selectively inclinable tray is removably attachable to the wheelchair. A toilet assembly is removably attachable to the wheelchair.

Abstract: An elevatable wheelchair having a horizontal base and a plurality of front and rear wheels for traveling over a surface, a support frame upstanding from the rear of the base, a cantilever beam pivotally attached at its rear end to the frame above the base, a seat pivotally mounted on the forward end of the cantilever beam, a power lift operably connected to the cantilever beam between its ends for pivoting the beam on the frame to elevate or lower the beam forward end and the seat, and a stabilizing arm between the seat and the frame, vertically offset from the beam, and movable with the beam and seat to control seat pivot orientation and to stabilize the seat.

Abstract: A foldable frame and body for a vehicle or trailer provides a chassis, at least one frame member pivotally mounted to the chassis at a first pivot point, a hinge arm pivotally mounted to the chassis at a second pivot point and a release arm for closing the frame which is pivotally connected to the frame member at a third pivot point and to the hinge arm at a fourth pivot point such that the fourth pivot point moves toward a line between the second and third pivot points as the frame is unfolded, leveraging the frame to an open position. The foldable vehicle or trailer is lightweight and may be motorized or human-powered.